[EMAIL PROTECTED] wrote:
>
> Comparing coaxial and Toslink, there is actually a measurable
> difference between what you get at the other end of the line. The
> archives of rec.audio.pro have discussions of this phenomenon, though
> it's been a number of years since I've kept up with this subject.
>
> The issue is "transport jitter", where the timing between the bits
> varies by some amount (in the range of 5 to 500 picoseconds, if memory
> serves). The bits received are in fact the same as those that were
> transmitted, so if you are transporting the bits with the intention of
> storing them (i.e., on a CD or an MD) it doesn't make a difference what
> you use. However, when you feed these timing variations into a D/A
> converter, it can affect the output waveforms.
>
> Inside single-box setups, clocking tends to be fairly jitter
> resistant. It can be a bigger issue if you put together systems with
> separate transport and D/A sections (e.g., a home theatre surround
> decoder fed by DVD). It's also an issue for pro audio setups where
> they have to transport audio around the studio or remote recording
> location for monitoring. There may have been advances in the past few
> years that reduce such effects; I'm not sure.
>
> Anyhow, Toslink tends to exhibit greater amounts of jitter than coax or
> other fiber optic media. If you don't hear a difference, don't let it
> bother you.
>
> Romain Kang Siemens Info/Comm Products, San Jose R&D
> [EMAIL PROTECTED] formerly Pyramid Technology Corporation
Note that if you buffer the signal, jitter is almost eliminated!
Cheers,
Ralph
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